calibrator: Bayesian calibration of complex computer codes

Performs Bayesian calibration of computer models as per
Kennedy and O'Hagan 2001. The package includes routines to find the
hyperparameters and parameters; see the help page for stage1() for a
worked example using the toy dataset. A tutorial is provided in the
calex.Rnw vignette; and a suite of especially simple one dimensional
examples appears in inst/doc/one.dim/.